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九年级数学：一元二次方程，怎么求k的值？根的判别式和韦达定理
九年级数学：一元二次方程，怎么求k的值？根的判别式和韦达定理
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题132/168
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